Improvement in steam-pumps



2 Sheets-sheen 1.

JQB'VANS. Steam-Pump- 200,035. Patented Feb. 5,1878.

@z -f N L @l L l 0 y l C v l] o O 1 WITNESSES Attorney 2 sheets-sheer 2.v J. EVANS. Steam-Pump.

Ne. 200,035. Patented Feb. 5, 187s.

C ,l "al c l MMR By /gw-/Q/ G *zulttorney NA PETERS, PHDT'B-LITHOGRAPHER WASHINGTON D C UNITED STATES PATENT OEEIcE.

JOSEPH EVANS,IOF VOLVERHAMPTON, GREAT BRITAIN.

IMPROVEMENT -IN STEAM-PUMPS.

Specification forming part of Letters Patent No. 200,035, dated February 5,1878 application filed June 14, 1876.

To all lwhom it may concern:

Be it known that I, JOSEPH EVANS, of Wolverhampton, in the county of Stai'ord,.in the Kingdom of Great Britain, have invented certain new and useful Improvements in Pumps;

and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specication.

This invention refers to a method of reversing the action of pumps provided with either piston-valves, as described, or with slide-valves actuated by means of an eccentric, disk, crank, or equivalent, on the revolving shaft, so that the suction-pipe becomes the delivery-pipe and the delivery-pipe becomes the suction-pipo; and consists in reversing1 the direction of the rotation of the revolving shaft in the following manner: In the case of pumps worked by means of a steam-cylinder I actuate the steam-valve by means of a separate eccentric, disk, crank, or equivalent, working loose on the revolving shaft, and regulated by a fast stud or block in any manner now in use for reversing the action of steam-engines, or by any suitable reversing arrangement now in use for reversing the action of steam-engines, as will be readily understood. In the case of pumps worked by hand or other animal power, the reverse action of the pump is effected by simply reversing the ro# tary motion.

For reversible pumps the retention valve or valves, if used, must, of course, be alternately arranged to suit the direction of the waterflow.

Having thus stated the nature of the said invention, I now proceed more particularly to describe the manner of performing the same with reference to the accompanying drawings.

The same letters occurring on different views indicate the same parts.

My invention is illustrated by part of Fig.

ure 2, which is a plan of Fig. 1, partly in section, namely, on the line cf of Fig. 1.

A is the piston-valve. B is a stud or crankpin turned out ofthe revolving shaft C, and having its center the proper distance from the shaft-center to give the required stroke to the valve. The stud or crank-pin Bis set in such position relatively to the crank or other part giving motion to -the pump that the valve shall open and close the ports at the proper time. An enlarged view of the valve A, showing also the ports and pump, is illustrated by Figs. 3 and 4.

Fig. 3 is a section on line ab of Fig. 4. Fig. 4 is a sectional plan taken on line e f of Fig. 1, the same as is shown in Fig. 2, but to an enlarged scale.

Referring to Figs. 3 and 4, A is the pistonvalve. D is the suction opening into the valvebox. The pump-piston E is represented as moving in the direction of the arrow d, and the suction and delivery will be readily understood by means of the arrows. F is the delivery-opening from the valve-box.

It will be seen from the drawing that the cylinder inside which the valve works is itself a separate piece from the main casting of the pump and box, and is retained in its place by means ofthe lids G G.

The small openings c c, &c., are used for the working part of the cylinder in preference to oblong openings, so as to retain a proper facing all around, and are used for the ends beyond the working part, so as to retain an equal distribution of metal round the cylinder.

The collars or faces H H of the valve A are the same distance from the outer edge of one to the outer edge of the other as the outer edge of one port is from the outer edge of the other port, but slightly-say about one-sixteenth of an inchfarther apart from the inner edge of one collar to the inner edge of the other collar than the inner edge of one port to the inner edge of the other port, so as to prevent the liquid in the pump from being trapped as the valve-collar is traveling over the ports.

The steam-valve is worked by means of an eccentric, L, Xed on a boss, M, to which is also fixed a hand-wheel, N. The said boss M is bored to turn on the shaft C, and has a slotted part, 0, cut out of its circumference. A stud, I), fixed in the shaft C, acts as a stop for the boss M at each end of the slotted part O- that is, for forward and backward stroke of the'engine and pump.V The studP acts also as a Y Y guide to .the boss M to keep itin position sidewise.

Y In starting the engine the forward or back-V Y ward stroke will be given accordingly as the hand-Wheel N is turned backward or'forward.

It Will readily be seen that from the ar-y rangement of the' pump, actuated as shown,V VVon reversing the revolving Vshaft G, What Y Was before the suction-opening to the pumpvalve VWill become the delivery-opening,V and what Was before the'deliveryopening Will be- Y Waterto avoid the action of frost, or may be emptied of thickliquidssuch,v for instance, as

tar-to preventzcongealing. This arrangement Y Vis also useful in starting the pumping-engine.V Y

Having `now'particularly described and ascertained the nature of my said invention, and

in what manner the same is to be performed,

I wish to state distinctly that I do not claimV any of the parts I have described iiV taken byV themselves, as many of themareold, and I am not sufciently assured ofV thenovelty of Y any of them to claim them as my invention 5 but. I claim as my invention- Y Y Y Y L In combination with the reversing-eccentric vto actuate the steam-valve of a steampumping engine, an eccentric disk orV crank for actuating thc pump-valve, substantially as Y Y Y shown and described. Y Y Y Y 2. The reversing-eccentric to actuateV the steam-valve of a'steam-pumping engine andV an eccentric diskV or crank for actuating the pump-valve, in combination with the steam and pump valve, substantially as described.

In testimony'that I claim the foregoing as Y my own I aiixV my signature inpresence of Y two Witnesses. Y

Witnesses:

STEPHEN WATKINs, .J AMES A.V WYNN.

Y Josu. EVANS. 

